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Electrolyte for lithium ion capacitor and lithium ion capacitor including the same

a lithium ion capacitor and lithium ion technology, applied in the direction of electrical apparatus casings/cabinets/drawers, casings/cabinets/drawers details, transportation and packaging, etc., can solve the problems of short charging and discharging time of general capacitors, degrading the capacity of general capacitors, and increasing resistan

Inactive Publication Date: 2011-12-15
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electrolyte for a high-capacity and low-resistance lithium ion capacitor. The electrolyte includes a lithium salt and a mixing solvent containing cyclic carbonate compounds, linear carbonate compounds, and propionate compounds. The mixing ratio between the cyclic carbonate compounds and the linear carbonate compounds is important and affects the performance of the lithium ion capacitor. The electrolyte can be used in a lithium ion capacitor with a high-capacity and low-resistance.

Problems solved by technology

The general capacitor has a very short charging and discharging time and a long lifespan but has a limitation when being used as a storage device due to a high output density and a small energy density.
However, when the electrolyte used in the rechargeable battery of the related art is used in the lithium ion capacitor, there are problems in that the capacity thereof is degraded, the resistance is increased, and the output characteristics are degraded, under the low temperature.

Method used

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  • Electrolyte for lithium ion capacitor and lithium ion capacitor including the same
  • Electrolyte for lithium ion capacitor and lithium ion capacitor including the same
  • Electrolyte for lithium ion capacitor and lithium ion capacitor including the same

Examples

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[0084]Graphite (KS6, Timcal company) was used as a cathode active material and super-P (Timcal company), CMC, and SBR were mixed and dispersed in a weight ratio of 95:3:1.5:1.5, together with water, thereby producing a slurry. A sheet having a thickness of 80 μm was produced by coating, drying, and pressing a slurry on a copper foil current collector and was cut to be 3 cm in width and 4 cm in length, thereby producing the anode. The produced anode was impregnated in the electrolyte to dope the lithium ions via the electrochemical doping method. As the electrolyte, a mixing solvent including ethylene carbonate (EC), propylene carbonate (PC), methyl propionate (MP), and ethyl methyl carbonate (EMC), and a solvent including 1.2 M of LiPF6 were used. The mixing ratio (EC:PC:MP:EMC) between the mixing solvents was set to be 3:1:1:3.

[0085]The cathode active material used non-porous carbon (available from GS Caltex Company) and carbon black, CMC, and SBR were mixed and dispersed at a rati...

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Abstract

There are provided an electrolyte for a lithium ion capacitor and a lithium ion capacitor including the same. The electrolyte for a lithium ion capacitor according to the present invention includes: a lithium salt; and a mixing solvent including i) two or more compounds selected from a group consisting of cyclic carbonate compounds, ii) one or more compounds selected from a group consisting of linear carbonate compounds represented by a specified Formula, and iii) one or more compound selected from a group consisting of propionate compound represented by a specified Formula.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application No. 10-2010-0054827 filed on Jun. 10, 2010, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an electrolyte for a lithium ion capacitor and a lithium ion capacitor including the same, and more particularly, to an electrolyte for a high-capacity and low-resistance lithium ion capacitor and a lithium ion capacitor including the same.[0004]2. Description of the Related Art[0005]A stable supply of energy is one of the most important factors in the operation of various electronic products such as information telecommunication devices. Generally, the function is performed by a capacitor. That is, the capacitor serves to charge and discharge electricity in and from circuits of information telecommunication devices and various other...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01G9/035H01G9/022H01G11/06H01G11/22H01G11/24H01G11/30H01G11/32H01G11/38H01G11/54H01G11/60H01G11/62H01G11/68
CPCH01G11/58Y02E60/13H01G11/60
Inventor LEE, SANG KYUNCHOI, DONG HYEOKJUNG, HYUN CHULKIM, BAE KYUN
Owner SAMSUNG ELECTRO MECHANICS CO LTD